There ’s __________“u” and __________“s” in __________ word “use”.

Look, what have you done?—Sorry. I think if I _____ another chance, I’ll do it better.

My father has worked in this factory fifteen years.[ ]

Can you tell me how to learn Chinese well? —Sure. The best way _____ Chinese is often using it more.

The boy is very fat ______ eating ______ food. [ ]